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pl. of Radius.

parate wedge-shaped solids, with the joints between them disposed in the direction of the radii of the curve; used to support the wall or other weight above an opening. In this sense arches are segmental, round (i. e., semicircular), or pointed.

Between the radii, or rays; -- in zoölogy, said of certain parts of radiate animals; as, the interradial plates of a starfish.

t will be the logarithm of its abscissa. -- Logarithmic spiral, a spiral curve such that radii drawn from its pole or eye at equal angles with each other are in continual proportion. See Spiral.

l numbers, those commencing at 1; natural sines, cosines, etc., those taken in arcs whose radii are 1.

One of the symmetrical halves of any one of the radii, or spheromeres, of a radiate animal, as a starfish.

Situated around the radii, or radial tubes, of a radiate.

Of or pertaining to a radius or ray; consisting of, or like, radii or rays; radiated; as, (Bot.) radial projections; (Zoöl.) radial vessels or canals; (Anat.) the radial artery. Radial symmetry. (Biol.) See under Symmetry.

Formed of, or arranged like, rays or radii; having parts or markings diverging, like radii, from a common center or axis; as, a radiated structure; a radiated group of crystals.

The barbs of the radii of a feather; barbules.

One of a number of lines or parts diverging from a common point or center, like the radii of a circle; as, a star of six rays.

direction opposed to that of its motion by orifices at right angles, or inclined, to its radii.

A part of a circle comprehended between two radii and the included arc.

enter of one bastion to that of the next, or the line curtain produced to the two oblique radii in front. H. L. Scott. -- Side by side, close together and abreast; in company or along with. -- To choose sides, to select those who shall compete, as in a game, on either side. -- To take sides, to attach one's self to,…

ches of evergreen trees. It constructs a triangular web, or net, usually composed of four radii crossed by a double elastic fiber. The spider holds the thread at the apex of the web and stretches it tight, but lets go and springs the net when an insect comes in contact with it.

t an axis; a rotating disk, whether solid, or a frame composed of an outer rim, spokes or radii, and a central hub or nave, in which is inserted the axle, -- used for supporting and conveying vehicles, in machinery, and for various purposes; as, the wheel of a wagon, of a locomotive, of a mill, of a watch, etc. The gas…